众所周知,早播的冬小麦耐寒性和越冬能力差,是由于组织衰老,大批叶子枯萎,从而减弱了光合作用,抑制了御寒物质的积累和浓缩;晚播的冬小麦发育不良、越冬能力较弱主要是由于入冬前叶片中可溶性糖积累不足和春天再生能力不强。耐低温性能不仅取决于地上物质数量上的积累和植物组织质量上的变化, It is well-known that the early-sowing winter wheat has poor cold tolerance and overwintering ability, which is due to the aging of tissues and the withering of a large number of leaves, thus weakening the photosynthesis and inhibiting the accumulation and concentration of warm-blooming substances. The late-sowing winter wheat is poorly developed and the overwintering ability is mainly Due to lack of accumulation of soluble sugar in leaves before winter and spring regeneration ability is not strong. Low temperature resistance depends not only on the amount of accumulation of plant material and the quality of plant changes,